Mobil 1 is a great oil, it is an affirmative bad idea to not change your oil for 15,000 miles though. Fram filters are great, and I've used both motorcraft and Fram. I'm not going back to the motocraft though, simply because you can't grip it as easily as a Fram filter. The only people I've personally witnessed that have used Fram filters that failed were complete morons, and relied on Wal-Mart, and other places to do oil changes for them. Then again thats only the people I've seen complaining about them. Thats not to say there are people who have actually changed their own oil themselves that have had problems with them, because their probably are some.